Both Canon 1D X II and Samsung NX30 have 20.0 MP resolution sensors but Canon 1D X II's sensor is Full frame (36 x 24 mm ) and Samsung NX30's sensor is APS-C (23.5 x 15.7 mm ).
Since Canon 1D X II's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Samsung NX30.
Below you can see the 1D X MII and NX30 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 1D X II and Samsung NX30 Cameras
As seen above, Canon 1D X II has a 2.3x Larger sensor area than Samsung NX30. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.
DxOMark Sensor Scores
Both Canon 1D X II and Samsung NX30 sensors have been tested by DxoMark. DxoMark scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Of the two cameras that we are comparing, 1D X MII has scored 88, 11 points higher than NX30.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon 1D X II
88
24.1 bits
13.5 Evs
3207 ISO
Samsung NX30
77
23.5 bits
12.4 Evs
1014 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Canon 1D X II
or the
Samsung NX30 ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(Full frame versus APS-C),
so compare them at the same framing rather than the same focal length.
Put the same focal length on the smaller sensor and it will show less depth of
field, not more, because it also crops tighter. The calculator shows the
full frame equivalent focal length for each body so you can match the framing.
